Tag: DIY

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DIY Psion Series 5mx serial cable at a relatively low cost

Every Psion collector knows that the parts for Psion 5MX are scarce nowadays. The serial cable is no exception. The only current source is Psionex, but it can cost more than $50 with shipping to US. Too expensive for just a used cable.

Recently I asked about this on Reddit, and a kind user suggested me to look into some PCMCIA dongles, as they seems to have similar connectors. I did that and happily discovered it is possible to make a Psion serial cable out of PCMCIA dongles, at a relatively low cost, and with a good-looking finish. Let me document the process here.

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Bose QC15 headphone cable pinout schematic

I love my old Bose Quietcomfort 15 headphone, so much that I decide to add a Bluetooth receiver to it to keep it in service for a couple of more years. During the process, I needed to DIY a short audio cable to connect the headphone and the Bluetooth receiver. I couldn’t find any information about the pinout on the Internet, so I disassembled the original cable to find out the schematic.

QC 15 audio cable disassembled.
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Bluetooth Receiver TT-BR06 volume mod

Last year I bought a TaoTronics TT-BR06 Bluetooth Receiver to use with my iPhone. It works great, and the sound quality is fine. The only issue was that the volume was too loud. I am using it with a pair of Sony XBA-N3 earphone, it was uncomfortably loud even on the lowest volume.

Front of the product

Recently I looked up for this product on Amazon, and I found a review that mentions a modification that can adjust its output gain. I tried it and it worked like a charm. So I’m documenting this mod here. Maybe it also applies to other similar brands of Bluetooth receivers. So if you have similar problems, you can have a try.

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Nokia 770从入手到精通（六）N770 的USB Host模式(下)软件篇

USB键盘的使用
如果完全按照上一篇日志来的话，切换到usb host模式，插上线之后键盘就应该可以工作了，但是键位有点别扭，比如主回车键在xterm下居然不是回车，得按小键盘上的回车键才行。
USB键盘要玩rdesktop的话，需要在rdesktop的选项中勾上“BT keyboard”，进去以后键盘操作很爽~

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Nokia 770从入手到精通（六）N770 的USB Host模式(上)硬件篇

USB设备分为HOST（主设备）和Client（从设备），只有当一台HOST与一台Client连接时才能实现数据的传输。

N770默认是工作在Client状态的，所以连接到电脑上以后会以一个U盘的形式存在。现在我需要把N770变成一个USB Host，支持连接鼠标、键盘、硬盘、U盘、MP3、USB HUB、USB转RS232等一堆设备，好处多多。

哈哈，这只是画画饼而已，N770的确可以接上述设备，但是实用性不高。不过，对于玩机一族，还是很值得一试的~

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